|Pages vs. Sheets|
“Is that 12 sheets of paper or 12 numbered pages?”
Sheets and pages are often confused for one another. "Page" often refers to the number of individual fronts and backs, often called "numbered pages." "Sheet" is a term that describes the whole piece of paper. For example an 11x17 newsletter that folds in half has four numbered pages, but is only one sheet of paper.
The best way to describe your project would be to refer to the numbered pages and, in the case of a booklet, if that number includes the cover. For example: “I would like to print a booklet that has 16 numbered pages, including the cover.” We’ll figure out the number of sheets.